Spectroscopic Quadrupole Moments in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>96</mml:mn><mml:mo>,</mml:mo><mml:mn>98</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>: Evidence for Shape Coexistence in Neutron-Rich Strontium Isotopes at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mm

Clément, E.; Zielińska, M.; Görgen, A.; Körten, W.; Péru, S.; Libert, J.; Goutte, Héloϊse; Hilaire, Stéphane; Bastin, B.; Bauer, C.; Blazhev, A.; Bree, N.; Bruyneel, B.; Butler, P. A.; Butterworth, J.M.; Delahaye, P.; Dijon, A.; Doherty, D. T.; Ekström, Andreas; Fitzpatrick, C.; Fransen, C.; Георгиев, Г.; Gernhäuser, R.; Hess, H.; Iwanicki, J.; Jenkins, D. G.; Larsen, A. C.; Ljungvall, J.; Lutter, R.; Marley, P.; Moschner, K.; Napiórkowski, P.; Pakarinen, J.; Petts, A.; Reiter, P.; Renstrøm, T.; Seidlitz, M.; Siebeck, B.; Siem, S.; Sotty, C.; Srebrny, J.; Stefanescu, I.; Tveten, G. M.; Walle, J. Van de; Vermeulen, M. J.; Voulot, D.; Warr, N.; Wenander, F.; Wiens, A.; Witte, H. De; Wrzosek-Lipska, K.

doi:10.1103/physrevlett.116.022701

Cited by 86 publications

(36 citation statements)

References 54 publications

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“…Eventually, the prolate configuration was shifted towards a more triaxial character in 104,106,108 Mo. In a recent paper, the spectroscopic moments of the 2 [57]. This data suggests the presence of shape coexistence between spherical and prolate deformed states with a shape inversion from a spherical to a prolate ground-state band at N = 60.…”

Section: Discussionmentioning

confidence: 96%

Lifetime measurement of neutron-rich even-even molybdenum isotopes

Ralet¹,

Piétri²,

Rodríguez³

et al. 2017

Phys. Rev. C

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Background: In the neutron-rich A ≈ 100 mass region, rapid shape changes as a function of nucleon number as well as coexistence of prolate, oblate, and triaxial shapes are predicted by various theoretical models. Lifetime measurements of excited levels in the molybdenum isotopes allow the determination of transitional quadrupole moments, which in turn provides structural information regarding the predicted shape change. Purpose: The present paper reports on the experimental setup, the method that allowed one to measure the lifetimes of excited states in even-even molybdenum isotopes from mass A = 100 up to mass A = 108, and the results that were obtained. Method:The isotopes of interest were populated by secondary knock-out reaction of neutron-rich nuclei separated and identified by the GSI fragment separator at relativistic beam energies and detected by the sensitive PreSPEC-AGATA experimental setup. The latter included the Lund-York-Cologne calorimeter for identification, tracking, and velocity measurement of ejectiles, and AGATA, an array of position sensitive segmented HPGe detectors, used to determine the interaction positions of the γ ray enabling a precise Doppler correction. The lifetimes were determined with a relativistic version of the Doppler-shift-attenuation method using the systematic shift of the energy after Doppler correction of a γ -ray transition with a known energy. This relativistic Doppler-shiftattenuation method allowed the determination of mean lifetimes from 2 to 250 ps. Results: Even-even molybdenum isotopes from mass A = 100 to A = 108 were studied. The decays of the low-lying states in the ground-state band were observed. In particular, two mean lifetimes were measured for the first time: τ = 29.7 Conclusions:The reduced transition strengths B(E2), calculated from lifetimes measured in this experiment, compared to beyond-mean-field calculations, indicate a gradual shape transition in the chain of molybdenum isotopes when going from A = 100 to A = 108 with a maximum reached at N = 64. The transition probabilities decrease for 108 Mo which may be related to its well-pronounced triaxial shape indicated by the calculations.

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Section: Discussionmentioning

confidence: 96%

Lifetime measurement of neutron-rich even-even molybdenum isotopes

Ralet¹,

Piétri²,

Rodríguez³

et al. 2017

Phys. Rev. C

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“…Shape transitions in the A ≈ 100 region have been the subject of intense studies lately. The rapid change from the near spherical 96 Sr to the strongly deformed 98 Sr is well known [1,2]. Due to the proton subshell closures at Z = 38 (π p 3/2 ) and at Z = 40 (π p 1/2 ) and the neutron subshell closures at N = 50 (νg 9/2 ), N = 56 (νd 5/2 ), and N = 58 (νs 1/2 ), the N = 50-58 ( 88−96 Sr) strontium and ( 90−98 Zr) zirconium isotopes have the low-energy structure of a semimagic nucleus.…”

Section: Introductionmentioning

confidence: 99%

Lifetime measurements and shape coexistence in Sr97

et al. 2019

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Delayed γ rays from neutron-rich A = 97 fission fragments were measured using the Lohengrin spectrometer at the high-flux reactor of the Institut Laue-Langevin in Grenoble. Several lifetimes of excited states in 97 Sr were measured using the fast-timing technique. The nucleus 97 Sr exhibits shape coexistence and is located exactly at the border of the spherical (N 58) and deformed (N 60) ground-state deformation. It is of particular interest to study the shape-coexisting structures at the spherical-deformed border (N = 59). The determined lifetimes within this work are compared to an interacting boson-fermion model calculation that is based on the microscopic energy density functional to provide a better understanding of the spherical-deformed border in strontium isotopes.

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“…A variety of theoretical explanations exist to explain this shape change including the crossing of two different meanfield configurations; one governed by spherical shell effects and the other a deformed intruder containing multiple particlehole excitations, dominated by the integrated residual protonneutron interaction [9,10]. Experimental evidence for coexisting spherical and deformed configurations exists for [96][97][98] Sr [11,12], 96-104 Y [13][14][15], and 98-100 Zr [10,[16][17][18][19]. A strong interaction between occupied π g 9/2 -νg 7/2 spin-orbit partners has been proposed to play a major role in obliterating the N = 56, 58 and Z = 38, 40 spherical subshell closures, leading to collective motion [20][21][22].…”

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confidence: 99%

Lifetimes and shape-coexisting states of Zr99

Spagnoletti¹,

Simpson²,

Kisyov³

et al. 2019

Phys. Rev. C

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Lifetimes of intermediate-spin states in two rotational bands of 99 Zr have been measured. These states were populated following the neutron-induced fission of 235 U at the PF1B beamline of the Institut Laue-Langevin, Grenoble, during the EXILL-FATIMA campaign. The nucleus 99 Zr 59 exhibits shape coexistence and lies precisely on the border of an abrupt change in ground-state deformation when going from N = 58 to N = 60, making its study interesting for understanding the mechanisms involved in the rapid onset of deformation here. The B(E 2) values extracted for decays in the ν3/2[541] band allow quadrupole deformations of β 2 = 0.34(1) and 0.26(3) to be determined for the 821.6-and 1236.6-keV members, whereas β 2 = 0.32(3) was found for the 850.5-keV member of the ν3/2 [411] band. Some of the excited states known in 99 Zr have been reasonably described with interacting boson-fermion model (IBFM) calculations. Type-II shell evolution is proposed to play a major role in modifying single-particle energies in 99 Zr.

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Spectroscopic Quadrupole Moments inSr96,98: Evidence for Shape Coexistence in Neutron-Rich Strontium Isotopes atN=

Cited by 86 publications

References 54 publications

Lifetime measurement of neutron-rich even-even molybdenum isotopes

Lifetime measurement of neutron-rich even-even molybdenum isotopes

Lifetime measurements and shape coexistence in Sr97

Lifetimes and shape-coexisting states of Zr99

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